The setup of a suspension always leads to a compromise between comfort and safety. In order to counteract this
in a passive approach, one could attach a structural extension in the form of a dynamic vibration absorber to the
axle. Thus, energy of the wheel vibrations is diverted into the vibration absorber instead of the body. In comparison
to a classic dynamic vibration absorber, which is not in the sense of lightweight construction due to the additional
mass, our Fluid Dynamic Vibration Absorber (FDVA) reduces the dynamic mass by using a hydrostatic
transmission.

Mobile hydraulic linear actuators are a fixed part of many applications. Especially in mobile cranes, they are
used for the movement of the booms and are characterized with a light power to weight ratio. The kinematics can
be seen as a restriction of linear motor in mobile cranes. On one side the possible range of the motion and on the
other side the unfavourable constellations of the triangle of force are essentially restrictions in the construction of
mobile cranes. For the avoidance of these restrictions exists approaches by in the joints arranged hydrostatic
rotational motors. At present these solutions fails by a to high weight to force ratio, or they give no benefit in the
kinematics. In this article, a new approach of a hydrostatic rotational motor will be presented, which is
characterized by low weight and high torque. By the possibility to rotate endless these rotation hydrostatic
motors are predestined as a direct drive in the joints of mobile cranes, to get new possibilities in the kinematics
and the construction of the booms.

The performance characteristics of a hydro-pneumatic type accumulator on the responses of the hydrostatic drive
system are studied in this article. The physical system considered for the analysis consists of fixed displacement
pump, hydro-motor coupled with a loading unit and an accumulator. By varying the capacity and precharge
pressure of the hydraulic accumulator and load torque on the hydro-motor, the performance behaviour of the
accumulator is determined. In MATLAB/Simulink® environment, the simulation studies are made. By
comparing the simulation results with the test data, the model is validated. The studies made in this article may
be useful for the proper selection of accumulators in typical mining equipment.

Low damping property of hydraulic systems has been a remarkably troublesome issue for a few decades. The poor damping with two actuators or more is still intractable and pendent due to the complex coupling effect of different loads. A decoupling compensator based on pump/valve combined control is proposed for the system with dual actuators for mobile machinery. Using decoupling control of different load branches, the coupling hydraulic circuit with dual cylinders is transformed into two separate single-cylinder circuits with dynamic compensation. Compound motion tests on a 2-ton hydraulic excavator were carried out. The results indicated that the proposed compensator reduced velocity and pressure oscillations under different working conditions.